While at Sage and afterwards had considered this idea as well. It stemmed from a time long ago working at a company where we used Accpac for DOS and had a backup tragedy just like you described. In the wake of ""WTH how do make sure this never happens again"", as a form of redundancy (not to replace tape backup) I asked mgmt to buy an Accpac mod that would auto-zip the company code data on a scheduler or manual zip by pressing hotkey. It was cool it become our SVDATA / SUDATA and our way of restore-with-no-need-for-IT and did avert a future tragedy for us. At Sage, heard the same tragic story several times so I knew could be possible demand for MAS version of this.
After Sage, tried to gauge demand on this. It seemed like only clients who had suffered the backup tragedy were willing to consider it. Otherwise it was like ""no we love our BackupExec it works great"" or ""our IT vendor takes care of it - they receive alerts when backup failure occurs"" or ""this tragic story means that company had poor disaster recovery procedures it doesn't apply to us"". Couldn't argue with any of that.
This is my own $.02 but I think your market is smaller ma & pa shops, companies with previous history of backup failures (I must've fielded 20 calls in 14 years on this but still represents maybe .003% of cases), and actg depts allowed to make autonomous IT decisions. Also might be better to offer it as a redundant soln not as primary backup process otherwise the ""we already have a backup soln"" response prevails.. In the end, I think you could recover your dev costs and have a small client base that would religiously use the product. Whether it would be profitable long term well ....